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Determination of total N2 fixation rates in the ocean taking into account both the particulate and filtrate fractions

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/44833

Title: Determination of total N2 fixation rates in the ocean taking into account both the particulate and filtrate fractions
Authors: Konno, U. Browse this author
Tsunogai, U. Browse this author →KAKEN DB
Komatsu, D. D. Browse this author
Daita, S. Browse this author
Nakagawa, F. Browse this author
Tsuda, A. Browse this author
Matsui, T. Browse this author
Eum, Y.-J. Browse this author
Suzuki, K. Browse this author
Issue Date: 12-Aug-2010
Publisher: Copernicus Publications
Journal Title: Biogeosciences
Volume: 7
Issue: 8
Start Page: 2369
End Page: 2377
Publisher DOI: 10.5194/bg-7-2369-2010
Abstract: Using the 15N2 tracer method and high-sensitivity δ15N analytical systems, we determined N2 fixation rates for ocean samples by dividing them into particulate (>0.7 μm) and filtrate (<0.7 μm) fractions. While N2 fixation in the filtrate fraction had been ignored in previous studies, we found a significant N2 fixation rates in the filtrate fraction in our study. The areal N2 fixation rates in the western North Pacific Ocean estimated from the particulate fraction varied from <1 to 160 μmol N m-2 d?1, and those rates estimated from the filtrate fraction ranged from <0.5 to 54 μmol N m-2 d?1. Thus, N2 fixation in the filtrate fraction accounts for on average 50% (ranging from <10% to 84%) of the total N2 fixation rates. If these results are confirmed generally in the ocean, the new total N2 fixation flux, which includes fixation in the filtrate fraction, possibly doubles the original estimates; therefore, the revised influx may reduce the imbalance in the global oceanic fixed nitrogen budget.
Type: article
URI: http://hdl.handle.net/2115/44833
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 角皆 潤

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